Related by context. Frequent words. (Click for all words.) 61 solar irradiance 58 radiative forcing 58 atmospheric methane 57 atmospheric CO2 56 atmospheric CO 56 Younger Dryas 55 interglacial period 55 stratospheric ozone 55 CO2 concentrations 53 atmospheric carbon dioxide 53 sunspot cycle 53 interglacial 53 glacial melting 53 greenhouse warming 52 atmospheric concentrations 52 atmospheric circulation 52 greenhouse gas concentrations 52 sunspot activity 52 Antarctic ozone 51 hydrological cycle 51 #.#C [004] 51 Little Ice Age 51 mid latitudes 51 Medieval Warm Period 51 ozone depletion 50 aerosol particles 50 glaciation 50 icecaps 50 crustal 49 climate alarmists 49 lithosphere 49 species extinctions 49 magnetic reconnection 48 thermosphere 48 irradiance 48 solar nebula 48 anthropogenic 48 climate modelers 48 Pliocene 48 sunspot numbers 48 abundances 47 radioactive decay 47 oscillations 47 water vapor 47 temperature gradient 47 explosive eruptions 47 volcanism 47 oscillation 47 mass extinctions 47 minima 47 CH4 47 Polar Regions 47 polar caps 46 decadal 46 albedo 46 geomagnetic 46 degrees Fahrenheit warmer 46 ˚ C 46 perturbations 46 -# degrees Celsius [001] 46 anthropogenic climate 46 stratospheric ozone layer 46 ionospheric 46 gigatonnes 46 geomagnetic field 46 amplitudes 46 sulfur dioxide SO2 46 marine sediments 46 terrestrial ecosystems 46 earths 46 lavas 46 ° C 46 nitrogen fixation 46 biogenic 46 glacial melt 46 X ray emission 45 volcanic eruptions 45 troposphere 45 ENSO 45 galaxy formation 45 variability 45 Holocene 45 abiotic 45 fluxes 45 radiative 45 methane hydrates 45 sunspots 45 methane hydrate 45 CO2 45 solar corona 45 greenhouse gases GHG 45 equatorial Pacific 45 Brownian motion 45 continental drift 45 supercontinent 45 desorption 45 carbon dioxide 45 oxygen isotopes 44 picosecond 44 isotopic 44 magmatic